Kink band formation is a type of shear localization that occurs in an astounding variety of anisotropic materials including low-symmetry single crystals, fiber composites, oriented polymers, and biological materials. While this phenomena is associated with large load drops and occurs dynamically in many systems, stable kink band growth has been observed during uniaxial compression of accumulative roll bonded (ARB) Cu-Nb nanolaminates. This has allowed kink band formation to be studied using in situ SEM compression tests and digital image correlation (DIC) strain mapping of bulk compression specimens. It is found that kink bands initiate at specimen corners, propagate through specimens at high stress (>1 GPa) under a rising load, and induce significant accommodation strain fields in the surrounding material. Revisions to existing kink band models are proposed to enable accurate prediction of mechanical behavior and energy dissipation during kink band formation.